206 GENERAL SCIENCE 



In this way farmers enjoy the use and advantage of 

 waterworks the same as the people in the city. 



QUESTIONS AND EXERCISES 



1. Where have you seen a natural waterfall or a dam ? What 

 practical use can be made of such places ? 



2. What use could a man make of a swiftly-flowing stream pass- 

 ing through his farm? 



3. Make a water wheel and try it in some flowing water. 



4. Make a small windmill and fasten it in some exposed position 

 and observe how the wind affects it. What practical use is made 

 of such machines? 



